oracle中分组查询并且查询每组前几条数据
select * from (
SELECT b,c,row_number() OVER(PARTITION BY b ORDER BY c desc) e FROM test_table) t where e <= 3
b为分组字段, c为排序字段
oracle分组查询
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转载自chen-sai-201607223902.iteye.com/blog/2392631
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